摘要
东濮凹陷西洼南段老第三系属地堑型湖盆沉积 ,主要发育河流相、三角洲相、冲积扇相、扇三角洲相以及湖泊相。两条边界断层 ,尤其是西侧长垣断层的活动性控制着该区的岩相古地理格局 :断层活动强烈时 ,湖盆水域扩大 ,湖水加深 ,主要发育扇三角洲、三角洲及深湖 -半深湖沉积 ;断层活动减弱时 ,水体变浅或干涸 ,湖盆被充填 ,主要发育冲积扇或河流相沉积。
The Palaeogene system in the southern west sag of the Dongpu depression consists of rift lacustrine deposits, and is developed with fluvial, delta, alluvial, fan delta and lacustrine facies. The lithofacies palaeogeographic features of the district are controlled by activity of two boundary faults, especially the Changyuan fault at the western side. A strong movement of the faults results in increasing in basin size and water depth, and developing fan delta, delta and deep-semideep lake facies. A weak movement of the faults results in shallowing and filling of the lake basin, and developing alluvial fan and fluvial facies.
出处
《古地理学报》
CAS
CSCD
2000年第1期43-48,共6页
Journal of Palaeogeography：Chinese Edition
关键词
东濮凹陷
岩相古地理
沉积相
老第三系
lithofacies palaeogeography, sedimentary facies, rift lake, Palaeogene system, Dongpu depression
